Wearing a bracelet that combines black tourmaline and tiger's eye with an OM charm can offer the following effects in terms of protection:
 
Energy Shield: Black tourmaline acts as a protective shield, blocking and repelling negative energies and psychic attacks, while tiger's eye reinforces this protection.
Grounding and Stability: Black tourmaline's grounding properties help you stay centered and stable, making it easier to cope with life's challenges.
Confidence and Resilience: Tiger's eye's attributes can boost your confidence and courage, helping you face difficult situations with strength and resilience.
Spiritual Connection: The OM charm reminds you of your spiritual path and the interconnectedness of all things, fostering a sense of inner peace and balance.
It's important to note that the effectiveness of such a bracelet can vary from person to person, and its impact is also influenced by your beliefs, intentions, and how you use it. By wearing this bracelet with a mindful and positive attitude, you can harness its protective and spiritual benefits, helping you navigate life with increased strength and awareness.